Chemistry 20 September 7, 2012

SI Système international d’unités AKA: The International system of units Modern version of the metric system.

SI – Base Units Base Unit Name Common symbols What it measures Metre l length second t time mole n Amount of substance kilogram m mass

SI - Prefixes Prefixes can be added to base unit names to denote a multiple of that unit. EX: 1000 metres = 1 kilometre Please note that the base unit name for mass is the kilogram. For mass, although the base unit is the kilogram, we still denote things with prefixes on the word gram. EX: 3000 grams = 3 kilograms

SI – Table of Prefixes 106 103 102 101 100 10-1 10-2 10-3 10-6 Name Symbol Factor MULTIPLES mega M 106 kilo k 103 hecto h 102 deca da 101 Base Unit 100 FRACTIONS deci d 10-1 centi c 10-2 milli m 10-3 micro μ 10-6

SI - Staircase mega kilo hepto deca base deci centi milli micro

SI Examples Convert to their base units 2301 cm 16000 g

Dimensional Analysis Link to video

Dimensional Analysis - Examples Convert 20 dollars to pounds (1 CAD = 0.63 GBP) Convert 100 yards to metres (1 yard = 0.9144 metre)